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  #1  
Old April 23rd, 2010, 02:43 PM
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Rich Campbell
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Sound from under truck

I'm getting an intermittent noise coming from the back of my truck. Kind of sounds like a thin rod of metal is bouncing off something spinning. Not very loud and comes and go. I have checked all over the thing for something loose bit found nothing.

Only occurs when moving and seems to speed up with that.

Any ideas!?
Thanks
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  #2  
Old April 23rd, 2010, 03:48 PM
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Is everything full of oil that should be?

Ron
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Old April 23rd, 2010, 03:53 PM
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Yes all oil is full. Seems to come and go and is coming from the back of the truck.
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Old April 23rd, 2010, 03:55 PM
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where the sections of exhaust pipe come together may have loosen up
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Old April 23rd, 2010, 03:55 PM
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Loose torque converter?
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  #6  
Old April 23rd, 2010, 05:11 PM
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Stone trapped between a rotor and a backing plate?
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  #7  
Old April 23rd, 2010, 07:32 PM
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Stone??

I will check that out. It does seem to be coming from drivers rear wheel.
Do I need to pull the wheel or can you remove the back plate from the back with the wheel on.
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Old April 24th, 2010, 08:20 AM
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Not a stone. Good idea though. Much worse this morning. Sounds like a bad rattle. Coming from what appears to be the rear wheel. Has the sound of something bouncing around metal. I just had it inspected so maybe something in the brakes came loose? I search and found most tcase/diff problems cause a different noise. Maybe its a bearing? U joint?
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Old April 24th, 2010, 09:08 AM
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Richard, diagnosing the u-joints should be easy. Chock one side the the axle, jack up the other side, and put the transmission and/or transfer case in neutral. You should be able to spin the lifted wheel and driveshaft freely and there should be no pressure on the joints. You should be able to push/pull on them and not feel any play, event using a small pry bar inbetween the joints to check them.

Likewise if you think it's around the wheel, spin it and see if you hear the noise. Check the bearings by grabbing at 12 and 6 o-clock and push/pull in opposite directions.

hth,
charles
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Old April 24th, 2010, 09:45 AM
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will do....thanks
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  #11  
Old April 24th, 2010, 10:28 AM
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Check for a loose shock.
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  #12  
Old April 26th, 2010, 08:57 AM
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Pulled the wheel and check it for any wobble and there wasn't any. So I guess the bearing is ok. I jacked it up and it had some play turning the wheel since the other wheel was still on the ground. Maybe 2" play both ways....not sure if that is normal. The shock and spring seemed tight.

Noise comes and go's. Everything seems tight.

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  #13  
Old April 26th, 2010, 09:28 AM
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What about the u-joints? did you check them when you had a wheel up? Some play is normal because it's spread out over a bunch of things that add up. 2" doesn't sound ideal, but not terrible.
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  #14  
Old April 26th, 2010, 09:38 AM
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Did you wiggle the exhaust pipe and even the plastic wheel arch? You never know... Brake backing plate loose? Did you take the tire off and inspect the area?

Does your truck have a rear locker in it?
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  #15  
Old April 26th, 2010, 09:40 AM
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I didn't check the u-joints. That will be tonight, I just forgot about that since I was sure it was the bearing.

So I should jack one side up, put the tcase in neutral and spin the wheel? Am I only looking to replicate the noise of something else.....probably a dumb question.

Thanks
Rich
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  #16  
Old April 26th, 2010, 09:46 AM
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Jack up one side and put the tcase in neutral, take off hand brake. Spinning the wheel just verifies you have no pressure ont he joints. Then get under there and tug at the driveshaft, try twisting it etc. If the u-joints are bad it should be pretty obvious when there is no pressure on them. But if necessary use a small pry bar to put pressure on the joint and look for any movement. But usually once the pressure is off you can tell right away they are bad.
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  #17  
Old April 26th, 2010, 10:50 AM
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Cool....thanks.

Rich
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